require 'digest/md5' require 'active_support/core_ext/module/delegation' module ActionDispatch # :nodoc: # Represents an HTTP response generated by a controller action. One can use # an ActionController::Response object to retrieve the current state # of the response, or customize the response. An Response object can # either represent a "real" HTTP response (i.e. one that is meant to be sent # back to the web browser) or a test response (i.e. one that is generated # from integration tests). See CgiResponse and TestResponse, respectively. # # Response is mostly a Ruby on Rails framework implement detail, and # should never be used directly in controllers. Controllers should use the # methods defined in ActionController::Base instead. For example, if you want # to set the HTTP response's content MIME type, then use # ActionControllerBase#headers instead of Response#headers. # # Nevertheless, integration tests may want to inspect controller responses in # more detail, and that's when Response can be useful for application # developers. Integration test methods such as # ActionController::Integration::Session#get and # ActionController::Integration::Session#post return objects of type # TestResponse (which are of course also of type Response). # # For example, the following demo integration "test" prints the body of the # controller response to the console: # # class DemoControllerTest < ActionController::IntegrationTest # def test_print_root_path_to_console # get('/') # puts @response.body # end # end class Response < Rack::Response DEFAULT_HEADERS = { "Cache-Control" => "no-cache" } attr_accessor :request attr_writer :header alias_method :headers=, :header= delegate :default_charset, :to => 'ActionController::Base' def initialize super @header = Rack::Utils::HeaderHash.new(DEFAULT_HEADERS) end # The response code of the request def response_code status.to_s[0,3].to_i rescue 0 end # Returns a String to ensure compatibility with Net::HTTPResponse def code status.to_s.split(' ')[0] end def message status.to_s.split(' ',2)[1] || StatusCodes::STATUS_CODES[response_code] end alias_method :status_message, :message def body str = '' each { |part| str << part.to_s } str end def body=(body) @body = if body.respond_to?(:to_str) [body] else body end end def body_parts @body end def location headers['Location'] end alias_method :redirect_url, :location def location=(url) headers['Location'] = url end # Sets the HTTP response's content MIME type. For example, in the controller # you could write this: # # response.content_type = "text/plain" # # If a character set has been defined for this response (see charset=) then # the character set information will also be included in the content type # information. def content_type=(mime_type) self.headers["Content-Type"] = if mime_type =~ /charset/ || (c = charset).nil? mime_type.to_s else "#{mime_type}; charset=#{c}" end end # Returns the response's content MIME type, or nil if content type has been set. def content_type content_type = String(headers["Content-Type"] || headers["type"]).split(";")[0] content_type.blank? ? nil : content_type end # Set the charset of the Content-Type header. Set to nil to remove it. # If no content type is set, it defaults to HTML. def charset=(charset) headers["Content-Type"] = if charset "#{content_type || Mime::HTML}; charset=#{charset}" else content_type || Mime::HTML.to_s end end def charset charset = String(headers["Content-Type"] || headers["type"]).split(";")[1] charset.blank? ? nil : charset.strip.split("=")[1] end def last_modified if last = headers['Last-Modified'] Time.httpdate(last) end end def last_modified? headers.include?('Last-Modified') end def last_modified=(utc_time) headers['Last-Modified'] = utc_time.httpdate end def etag headers['ETag'] end def etag? headers.include?('ETag') end def etag=(etag) if etag.blank? headers.delete('ETag') else headers['ETag'] = %("#{Digest::MD5.hexdigest(ActiveSupport::Cache.expand_cache_key(etag))}") end end def sending_file? headers["Content-Transfer-Encoding"] == "binary" end def assign_default_content_type_and_charset! if type = headers['Content-Type'] || headers['type'] unless type =~ /charset=/ || sending_file? headers['Content-Type'] = "#{type}; charset=#{default_charset}" end else type = Mime::HTML.to_s type += "; charset=#{default_charset}" unless sending_file? headers['Content-Type'] = type end end def prepare! assign_default_content_type_and_charset! handle_conditional_get! set_content_length! convert_content_type! convert_language! convert_cookies! end def each(&callback) if @body.respond_to?(:call) @writer = lambda { |x| callback.call(x) } @body.call(self, self) else @body.each { |part| callback.call(part.to_s) } end @writer = callback @block.call(self) if @block end def write(str) str = str.to_s @writer.call str str end def set_cookie(key, value) if value.has_key?(:http_only) ActiveSupport::Deprecation.warn( "The :http_only option in ActionController::Response#set_cookie " + "has been renamed. Please use :httponly instead.", caller) value[:httponly] ||= value.delete(:http_only) end super(key, value) end # Returns the response cookies, converted to a Hash of (name => value) pairs # # assert_equal 'AuthorOfNewPage', r.cookies['author'] def cookies cookies = {} if header = headers['Set-Cookie'] header = header.split("\n") if header.respond_to?(:to_str) header.each do |cookie| if pair = cookie.split(';').first key, value = pair.split("=").map { |v| Rack::Utils.unescape(v) } cookies[key] = value end end end cookies end private def handle_conditional_get! if etag? || last_modified? set_conditional_cache_control! elsif nonempty_ok_response? self.etag = body if request && request.etag_matches?(etag) self.status = '304 Not Modified' self.body = [] end set_conditional_cache_control! end end def nonempty_ok_response? ok = !status || status.to_s[0..2] == '200' ok && string_body? end def string_body? !body_parts.respond_to?(:call) && body_parts.any? && body_parts.all? { |part| part.is_a?(String) } end def set_conditional_cache_control! if headers['Cache-Control'] == DEFAULT_HEADERS['Cache-Control'] headers['Cache-Control'] = 'private, max-age=0, must-revalidate' end end def convert_content_type! headers['Content-Type'] ||= "text/html" headers['Content-Type'] += "; charset=" + headers.delete('charset') if headers['charset'] end # Don't set the Content-Length for block-based bodies as that would mean # reading it all into memory. Not nice for, say, a 2GB streaming file. def set_content_length! if status && status.to_s[0..2] == '204' headers.delete('Content-Length') elsif length = headers['Content-Length'] headers['Content-Length'] = length.to_s elsif string_body? && (!status || status.to_s[0..2] != '304') headers["Content-Length"] = Rack::Utils.bytesize(body).to_s end end def convert_language! headers["Content-Language"] = headers.delete("language") if headers["language"] end def convert_cookies! headers['Set-Cookie'] = if header = headers['Set-Cookie'] header = header.split("\n") if header.respond_to?(:to_str) header.compact else [] end end end end